Mini Split Heat Pump

The Best 5 Mini Split Heat Pumps

Here are the best 5 Mini Split Heat Pumps on The Trade Table.

MrCool DIY Easy Pro® 24k BTU Ductless Mini-Split Heat Pump Complete System

The MrCool DIY Easy Pro® 24k BTU Ductless Mini-Split Heat Pump Complete System is a compact and efficient solution for heating and cooling small to medium-sized spaces up to 1,000 square feet. Designed for easy DIY installation, it includes an outdoor and indoor unit, as well as all necessary installation materials. The high-efficiency heat pump features a variable-speed compressor that adjusts to changing temperature and humidity levels for optimal comfort and energy savings. The sleek indoor unit can be mounted on a wall or ceiling and includes a remote control with various features like sleep mode, timer, and energy-saving mode. The quiet outdoor unit is designed for easy installation and weather protection. Reliable and efficient, the MrCool DIY Easy Pro® system is perfect for maintaining a comfortable environment year-round.

GREE Sapphire 24K BTU 21.5 SEER Wall Mount Mini-Split Single Zone Heat Pump

The Gree Sapphire 24K BTU 21.5 SEER Wall Mount Mini-Split Single Zone Heat Pump offers ultra high-efficiency heating and cooling with a quiet, unobtrusive design. Featuring industry-leading SEER and HSPF ratings, it delivers up to 90% heating capacity even in extreme cold down to -22°F. Equipped with Gree's G-10 Inverter Technology, it quickly and consistently reaches the desired room temperature. The durable outdoor unit, made of heavy gauge steel, is built for easy maintenance and all-weather durability. The system includes a wireless remote controller with a timer and a built-in computer for continuous error scanning, ensuring easy troubleshooting and repair. The Gree Sapphire enhances air quality and comfort with up to seven fan speeds and washable polymeric air filters. AHRI Certified and backed by a 5-year limited warranty, this heat pump is designed to blend seamlessly into any living space while providing reliable and efficient performance.

GREE Vireo+ Ultra 36K BTU 18 SEER Wall Mount Mini-Split Single Zone Heat Pump

The Gree Vireo+ Ultra 36K BTU 18 SEER Wall Mount Mini-Split Single Zone Heat Pump offers exceptional efficiency and versatility, extending its operating capacity to -31°F. Designed to blend seamlessly into any living space, its slim cabinet mounts easily on the wall and features an easy-to-read display for operating mode information. With four speeds, the unit ensures maximum comfort while operating quietly. Smart features include I Feel Mode, which adjusts airflow and temperature for personalized comfort, and sleep mode for energy savings with automatic temperature adjustments. The Energy Savings mode optimizes compressor and fan speeds to reduce energy costs.

MrCool DIY Easy Pro® 18k BTU Ductless Mini-Split Heat Pump Complete System

The MrCool DIY Easy Pro® 18k BTU Ductless Mini-Split Heat Pump Complete System is a high-performance heating and cooling solution for medium to large rooms. Featuring an 18,000 BTU capacity, it provides efficient, cost-effective year-round comfort. The mini-split design allows easy DIY installation without requiring ductwork, and the included remote control offers convenient temperature adjustments. The system includes an indoor and outdoor unit, and all necessary components for a complete setup. Its energy-efficient design, LED display with troubleshooting codes, and versatile installation options make it a great choice for any home. Additionally, it can be controlled via the SmartHVAC app, remote control, Amazon Alexa, or Google Assistant. Backed by a 1-year compressor and a 2-year parts warranty, the MrCool DIY Easy Pro® 18k BTU system ensures reliable and efficient heating and cooling for your home or office.

GREE Livo Gen4 30K BTU 20 SEER2 Wall Mount Mini-Split Single Zone Heat Pump

The Gree Livo Gen4 30K BTU 20 SEER2 Wall Mount Mini-Split Single Zone Heat Pump offers high efficiency and quiet comfort for heating and cooling large rooms. With a 30,000 BTU capacity and 230V compatibility, it features multiple modes, including Heating, Cooling, Auto, Dry, and Fan. The G10 Inverter and variable compressor technology ensure rapid and consistent temperature control, while the self-diagnostics tool simplifies maintenance. The unit includes multiple fan speeds, a sleep mode to prevent temperature fluctuations and a hidden backlight display. A handheld remote with a programmable timer and I Feel mode adjusts airflow and temperature based on the remote's location, providing personalized comfort.

Should I Leave My Mini Split On All The Time In Winter?

Leaving your mini-split on all the time during the winter can be beneficial for maintaining a consistent indoor temperature and improving energy efficiency. Mini-splits are designed to operate efficiently, especially when maintaining a steady temperature rather than constantly heating up a cold space. By leaving it on, the system can run at a lower power level most of the time, which can be more efficient than turning it on and off, as it avoids the energy surge required to heat the space from a cold start. Maintaining a constant temperature also helps prevent the room from becoming too cold, which could lead to comfort issues or potential problems like frozen pipes.

However, it is important to set the temperature to a reasonable level that balances comfort and energy use. Many modern mini-splits have eco or energy-saving modes that can help manage energy consumption effectively while the system runs continuously.

Pros of Leaving Your Mini Split on 24/7 in Winter

Lower Energy Bills

• Keeping the unit on all the time means it doesn’t have to work as hard to heat your space back up after the temperature drops, so it operates more efficiently. This can translate into lower power bills, especially if you have it set to a consistent thermostat setting.

Prevent Pipes from Freezing

• Running your mini-split continuously prevents the temperature from dropping enough for pipes to freeze, which could lead to water damage. As long as you have it set to at least 55°F, your pipes and water lines should stay thawed, helping you avoid costly water damage restoration in the future.  

Improve Air Circulation

• Keeping your mini split fan running moves the air in your room, improving circulation. This helps prevent cold spots, ensures even heating, and moves stagnant, stale air out. Improved airflow also helps with respiratory health and can reduce allergen buildup.

Peace of Mind

• Knowing your heater will automatically turn on if the temperature drops gives you peace of mind that your space won't get too cold. This is especially reassuring if you have kids, pets, or plants to keep warm. You can go about your day without worrying whether you turned the heat on or off.

Cons of Running Your Mini Split Continuously in Cold Weather

Leaving your mini-split running continuously through cold weather has some downsides to consider.

Increased energy usage

• Constant operation means higher energy bills. Mini-splits are efficient, but they still consume power. Running it 24/7 for heating can significantly increase your electricity usage and costs over the winter.

Shortened lifespan

• Continuous use can reduce the lifespan of the mini-split. The compressor, fans, and other components have to work harder in cold weather. This additional stress and run time causes more wear and tear, potentially shortening the unit's useful life by several years. It's a good idea to turn it off when you're away or sleeping to give it a break.

Risk of freezing

• If the outside temperature drops well below freezing, a mini-split running constantly may struggle to defrost itself and could freeze up. The refrigerant lines are particularly vulnerable. Turning the unit off periodically reduces this risk. It's also a good idea to install a mini split rated for low ambient temperatures suitable for your climate.

Higher maintenance

• More run time means the filters get dirtier faster and require more frequent cleaning or replacement. The drain line is also more prone to clogs from the increased condensation. Additional maintenance like professional servicing may also be needed more often.

How Do Mini Splits Work In Cold Weather?

Mini-split systems are designed to work efficiently even in cold weather, thanks to advanced technology that allows them to provide heating and cooling. They use a heat pump mechanism that extracts heat from the outside air, even when temperatures are low, and transfers it inside your home.

Here’s how they operate in cold weather:

1. Heat Pump Operation: In heating mode, the mini-split outdoor unit absorbs heat from the outside air. Even in cold conditions, some heat is still available in the air, which the system can capture.

2. Refrigerant Cycle: The captured heat is transferred to the refrigerant inside the system. The refrigerant, now heated, is compressed to raise its temperature further and then circulated to the indoor unit.

3. Heat Distribution: The indoor unit releases the heat into the room, warming the space. The mini-split continues this cycle to maintain a consistent indoor temperature.

4. Cold-Weather Adaptations: Modern mini-splits are equipped with advanced technology, such as inverter-driven compressors and cold-climate heat pumps, that allow them to operate efficiently in temperatures as low as -13°F (-25°C). Some units also have a defrost mode that prevents ice buildup on the outdoor unit, ensuring it continues to work effectively.

Because mini-splits are designed to be efficient, they can provide reliable heating in cold weather without significantly increasing energy costs, making them a good option for year-round climate control.

Should I Cover My Mini Split In Winter?

It's generally unnecessary to cover your mini-split system in winter, and in some cases, doing so could be detrimental. Mini-splits are designed to withstand harsh weather conditions, including snow, rain, and ice. The outdoor unit is built with durable materials that can handle winter elements, and it needs proper airflow to operate efficiently, especially if it is used for heating during the winter months.

Tips for Operating Your Mini Split Efficiently This Winter

Operating your mini-split efficiently this winter means finding the right balance to keep your home comfortable while optimizing energy usage. Here are some tips to help you get the most out of your unit:

Location Matter

• If you live in Birmingham, Alabama, this advice will be much different than living in New York since the temperatures will be much colder in New York.

Set a consistent schedule

• Establish a regular heating schedule to maintain a steady indoor temperature. Program your mini split to turn on around 30 minutes before you wake up in the morning and turn off around 30 minutes before bedtime. This allows it to efficiently heat the space without constantly turning on and off. Consider using a smart thermostat to automate the schedule.

Choose an ideal temperature

• The most efficient indoor temperature for winter is around 68-72 F. Any lower and your mini split has to work harder to maintain heat, using more energy. Any higher and you’re paying to heat an unnecessarily warm space. Find a temperature in that range that keeps you comfortably warm while still being energy efficient.

Use the fan only when needed

• Run the mini split's fan only when the heating or cooling is actively running. Keeping the fan continuously circulating can draw more power even when the unit isn’t calling for heating or cooling. The fan will turn on automatically when the mini-split starts heating or cooling your space.

Clean the air filters regularly

• Dirty, clogged air filters reduce airflow and make your mini-split work harder to heat your home. If you notice reduced airflow or strange noises from the unit, check and clean or replace the air filters once a month. Clean filters allow for the most efficient heating and help decrease energy costs.

Consider using supplemental heat

• If you have a larger space or want to avoid running your mini split constantly, consider using space heaters to supplement the heating in the rooms you use most. Run the space heaters on timers so they turn off automatically when you're not in the room. Make sure any space heaters you use are approved for unattended operation and have safety mechanisms like automatic shutoff if tipped over.

Common Reasons a Mini Split Fails to Heat a Room

The most common reasons a mini-split fails to adequately heat a room are:

Improper installation

• If the unit is not installed properly, it won’t operate efficiently. Make sure the mini split was placed in a spot with plenty of airflow and that the installation was done according to the manufacturer’s recommendations. Improper refrigerant charging during installation is a frequent culprit. Have an HVAC technician check that the right amount of refrigerant was added.

Dirty air filters

• Clogged air filters reduce airflow and efficiency. Check your mini split’s air filters at least once a month and replace them if they look dirty. Clean air filters allow for maximum airflow which helps the unit heat (or cool) the room.

Low refrigerant levels

• Over time, mini splits can lose refrigerant due to small leaks in the lines or seals. Low refrigerant reduces the unit’s ability to transfer heat. Have an HVAC pro check refrigerant levels and recharge the unit if needed. They can also locate and repair any leaks.

Thermostat issues

• If the thermostat is not set properly or malfunctioning, the mini split won’t heat adequately. Ensure the thermostat is placed on a wall away from direct sunlight and heat sources. The temperature should be set a few degrees higher than the current room temperature. If adjusting settings doesn’t help, it’s best to have an HVAC technician test the thermostat.

Compressor or coil failures

• Major components like the compressor, condenser coil, or evaporator coil can fail over time, reducing a mini split’s heating (and cooling) capacity. Unfortunately, these types of repairs often require replacement parts and a skilled technician to fix them. If your mini-split is more than 10 years old, these types of failures become more likely.

Improper Sizing

• Explore our mini sizing calculator to ensure your unit is perfectly suited for your space. An incorrectly sized unit could be the reason your room is cold.

Checking Your Mini Split Settings

The first thing to check is your mini split's settings. Make sure the unit is actually in heating mode and not cooling mode. The mode button or switch on your mini split's interface lets you select either heating or cooling - double-check that it's set to heating.

Next, check the set temperature. The mini split may not be keeping your room warm simply because the temperature is set too low. Bump it up a few degrees to something more comfortable like 68-72°F. Give the unit some time to reach the new set temperature. If the mini split still isn't heating properly, the filters could be dirty or clogged. When filters get clogged up with dust and debris, airflow is restricted which reduces the unit's efficiency. Shut off the power to your mini split and remove the filters. Rinse washable filters with water or vacuum non-washable filters. Let everything air dry completely before reinstalling the filters and turning the mini split back on.

Low Refrigerant Levels

Low refrigerant levels could also be the culprit. As refrigerant depletes over time, a mini-split won't heat as well. If your unit is more than a couple of years old and you've tried adjusting the settings and cleaning the filters without improvement, it's a good idea to call an HVAC technician to check the refrigerant levels. They can recharge the unit and get it heating like new again.

Lastly, make sure no obstructions are blocking the indoor air vents or outdoor unit. Furniture, curtains, snow, leaves, and debris can all reduce airflow and make a mini-split work harder to heat your space. Clear any blockages for maximum efficiency and heating power.

With a few adjustments and some basic maintenance, your mini-split should be back to keep you cozy and warm in no time. But if problems persist, call in a professional for a full diagnostic check and service. It's best not to delay for the most cost-effective repair and to avoid potential issues from lack of use.

Improving Air Circulation for Better Heat Distribution

Improving circulation is key to ensuring even heat distribution in your space. Cold spots typically mean that warm air isn’t circulating well from your mini-split to that area. Here are some tips to improve airflow and circulation:

Clear the air vents. Make sure no obstructions are blocking the air vents or intakes of your mini-split. Move furniture, rugs, curtains, or anything else that could be restricting air flow away from the vents.

 Increase Fan Speed

Increase the fan speed. If your unit has adjustable fan speeds, increase the speed to the highest setting. This will blow the warm air farther into the room and circulate it better. The faster the fan, the better the circulation.

Use ceiling fans. Ceiling fans can help push the warm air downwards from the ceiling and circulate it around the room. Run the ceiling fans at a medium or high speed in the same direction as your mini split's airflow. This complementary circulation will distribute the heat more evenly.

Leave interior doors open. Keep doors open between rooms so warm air can flow freely from room to room. Closing doors block circulation and prevent heat from reaching certain areas.

Buy an Air Purifier 

Consider an air purifier. An air purifier can help circulate air in the room even when your mini split fan isn’t running. Place the air purifier near cold spots in the room to help push warm air into that area. Run the purifier on a medium fan speed for the best circulation. Insulate and weatherize. Ensure there are no drafts or air leaks in the room allowing cold air to seep in. Add weather-stripping tape around doors and windows, seal up any cracks in walls or the foundation, and consider adding insulation to the attic or basement. Reducing heat loss will allow your mini-split to operate more efficiently.

By improving circulation and airflow in your space, your mini split will distribute heat more evenly for a comfortably warm room. Be patient, as it can take time for the temperature to balance out in all areas. If issues continue, it may be a sign of an underlying problem with your unit that requires service by an HVAC technician.

When to Call a Professional for Mini Split

Troubleshooting

• If your mini-split system is not heating or cooling properly, it's a good idea to troubleshoot the unit yourself first before calling an HVAC technician, which can cost $75-$150 per hour. Here are some common issues you may be able to fix yourself.

Filters

• Dirty or clogged filters are one of the most common reasons a mini-split fails to heat or cool efficiently. Check your mini split filters—most units have filters that need to be replaced every 1-3 months. If the filters look dirty, replace them. Clogged filters prevent air from circulating properly and reduce the unit’s efficiency.

Refrigerant Levels

Low refrigerant levels can also cause a mini-split to malfunction. As refrigerant naturally escapes over time, the levels need to be recharged. You'll need an HVAC technician to recharge the refrigerant. Signs you may need a recharge include:

• Not blowing cold/hot air
• Running constantly but not changing the room temperature
• Freezing up (for cooling models)
• Gurgling or bubbling sounds coming from the unit

Thermostat Settings

• Double-check that your mini split’s thermostat is set properly for heating or cooling. The thermostat controls the temperature the unit is set to maintain. If it’s incorrectly set, your room won’t heat or cool as expected. Set the thermostat a few degrees higher or lower and wait 10-15 minutes to see if your room temperature changes.

Drainage pipe

• For cooling models, check that the condensate drainage pipe is not clogged. The drainage pipe removes condensed water from the air. If clogged, it can cause the unit to freeze up or shut off. You may need to unclog the pipe or drain and clear out any blockages.

Frequently Asked Questions about Mini Split Heat Pumps

Here are some frequently asked questions about Mini Split Heat Pumps. 

What are mini split heat pumps?

Mini split heat pumps are heating and cooling systems that provide temperature control for individual rooms or zones. They consist of an outdoor unit and one or more indoor units connected by refrigerant lines. Mini-splits are known for their energy efficiency, easy installation, and ability to provide both heating and cooling.

How do mini split heat pumps work?

Mini split heat pumps transfer heat between the indoor and outdoor units using refrigerant. In cooling mode, they remove heat from the indoor air and release it outside. In heating mode, they absorb heat from the outdoor air and transfer it indoors. This process is facilitated by a variable speed compressor, which adjusts to maintain the desired temperature efficiently.

What are the benefits of using a mini split heat pump?

Mini split heat pumps offer several benefits, including:

• Energy efficiency: They use less energy compared to traditional HVAC systems.
• Easy installation: They don't require ductwork, making them easier and less invasive.
• Zoned heating and cooling: They allow precise temperature control in individual rooms or zones.
• Quiet operation: Both indoor and outdoor units are designed to operate quietly.
• Improved air quality: Many models feature advanced filtration systems to improve indoor air quality.

Can mini split heat pumps be installed by homeowners?

Some mini split heat pump systems, like the MrCool DIY Easy Pro® series, are designed for easy installation by homeowners without the need for professional assistance. These systems come with comprehensive installation guides and all necessary components. However, other models may require professional installation to ensure proper setup and operation.

How do I choose the right size mini split heat pump for my space?

Choosing the right mini split heat pump size depends on the size of the area you need to heat or cool. The capacity of mini-split systems is measured in BTUs (British Thermal Units). As a general rule:

• 12,000 BTU units are suitable for rooms up to 500 square feet.
• 18,000 BTU units are suitable for rooms up to 1,000 square feet.
• 24,000 BTU units are suitable for rooms up to 1,500 square feet.
• 30,000 BTU units are suitable for rooms up to 2,000 square feet. It's important to consult with a professional or refer to the manufacturer's guidelines to determine the appropriate size for your specific needs.

Are mini split heat pumps energy efficient?

Yes, mini-split heat pumps are known for their energy efficiency. They use inverter technology, which allows the compressor to adjust its speed based on the temperature needs, reducing energy consumption. High SEER (Seasonal Energy Efficiency Ratio) ratings, like the 20 SEER2 of the Gree Livo Gen4, indicate better energy efficiency and lower operating costs.

Do mini split heat pumps work in cold climates?

Yes, many mini-split heat pumps are designed to work efficiently in cold climates. For example, the Gree Livo Gen4 can operate in temperatures as low as -31°F, and the Gree Sapphire maintains up to 90% heating capacity even in extreme cold down to -22°F. These systems use advanced technologies to ensure reliable performance in various weather conditions.

How do I maintain my mini split heat pump?

Maintaining a mini split heat pump involves regular cleaning and inspection:

• Clean or replace the air filters every few months to ensure good air quality and efficient operation.
• Keep the outdoor unit free of debris and ensure proper airflow around it.
• Check the refrigerant lines for any signs of wear or damage.
• Schedule annual professional maintenance to check the system's performance and address potential issues. Regular maintenance helps extend the lifespan of your mini split heat pump and ensures optimal performance.